PitBull Unit Frames 4.0

v4.0.0-beta47-5-g54eda46

Change log

Shefki:
- Wrap the SetFont and SetAlpha calls in pcalls() which should prevent errors with them from breaking frames entirely.
- Make the Vengeance fix backwards compatible.
Benjamin Staneck:
- use a different ID for vengeance that works in 5.4
Shefki:
- Remove unnecessary constants that I added on accident.
- Hopefully stop some rare errors in LuaTexts about SetFont.